class Test:
    def __init__(self, foo):
        self.__foo = foo

    def __bar(self):
        print(self.__foo)
        print("run in __bar")

    def bar(self):
        print(self.__foo)
        print('run in bar')


def main():
    test = Test('hello')
    # AttributeError: 'Test' object has no attribute '__bar'
    # test.__bar()
    # AttributeError: 'Test' object has no attribute '__foo'
    # print(test.__foo)

    test.bar()


# from time import sleep
#
#
# class Clock(object):
#     """数字时钟"""
#     def __init__(self, hour=0, minute=0, second=0):
#         """初始化方法
#
#         :param hour: 时
#         :param minute: 分
#         :param second: 秒
#         """
#         self._hour = hour
#         self._minute = minute
#         self._second = second
#
#     def run(self):
#         """走字"""
#         self._second += 1
#         if self._second == 60:
#             self._second = 0
#             self._minute += 1
#             if self._minute == 60:
#                 self._minute = 0
#                 self._hour += 1
#                 if self._hour == 24:
#                     self._hour = 0
#
#     def show(self):
#         """显示时间"""
#         return '%02d:%02d:%02d' % \
#                (self._hour, self._minute, self._second)
#
#
# def main():
#     clock = Clock(23, 59, 58)
#     while True:
#         print(clock.show())
#         sleep(1)
#         clock.run()


if __name__ == "__main__":
    main()
